Image reading apparatus and image forming apparatus that improve skew correction accuracy

An image reading apparatus comprising:

• a conveying unit configured to convey a document along a conveyance path;
• a transparent member configured to form a part of the conveyance path;
• a reading unit including a light source configured to irradiate a document with light, and a reading portion configured to read an image of a document conveyed by the conveying unit through reflection light of the light irradiated from the light source via the transparent member;
• and
• an opposing member disposed to face the transparent member in an opposing direction at a reading position of the reading unit and configured to form the conveyance path together with the transparent member,
• wherein the opposing member includes an uneven surface portion facing the transparent member and including a plurality of recess portions which is regularly and continuously arranged when viewed in the opposing direction, the uneven surface portion being read by the reading portion of the reading unit, and
• wherein each of the plurality of recess portions extends in a line shape when viewed in the opposing direction.

An image reading apparatus comprising:

• a conveying unit configured to convey a document along a conveyance path;
• a transparent member configured to form a part of the conveyance path;
• a reading unit including a light source configured to irradiate a document with light, and a reading portion configured to read an image of a document conveyed by the conveying unit as reflection light of the light irradiated from the light source via the transparent member;
• and
• an opposing member disposed to face the transparent member in an opposing direction at a reading position of the reading unit and configured to form the conveyance path together with the transparent member,
• wherein the opposing member includes an uneven surface portion facing the transparent member, the uneven surface portion including a plurality of projecting portions and a plurality of recess portions which are regularly and continuously arranged when viewed in the opposing direction, the uneven surface portion being read by the reading portion of the reading unit,
• wherein each of the plurality of projecting portions extends in a line shape when viewed in the opposing direction, and
• wherein each of the plurality of recess portions extends in a line shape when viewed in the opposing direction.